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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc74b767016a2a36f5f94be21b3088141aab6591ba8a7e9f94a5253555c1d0a9' 
  AND token = 'k0xIC4Jb69S4WviZ1ntc2lYtSfMcCJT5eqtr4TQrfJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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