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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f509a0039c8ca9ff03af585f69f19d805260a8a8297f61b244d0f40b7e4b9a31' 
  AND token = '+S/d3PgdA6lWwq0EUiYtafCVZtHaHJFLHtR36kUOwjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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