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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c052306fea0c1a652b1bbb98583117d628aa2bd4e2d68fbf8d45c22e0db70b0d' 
  AND token = 'Sn+QSLTXYVvYVAwXUh7gepnuagpL5Z2gHmBHCE28HFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}