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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d527ca60eff4e1073f284da1cf706c58c516a1227deb154322a1f7c9322260' 
  AND token = 'mFCw72URFIpO4/2gy0PUgjTptB10+ccWAuFDn7NHV4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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