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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d2d355c1ce7ec8ce33d8b7f70b0fe42a18594f862e0c485a9a3f2aed9ce33bd' 
  AND token = 'ZZSOJm/d1xnguKuv8uoiptCNfQ0+b/sPC5Nch39kAX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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