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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4072de3d32a9b7c3dc2d284e6db509d22e486eec3fabca83f8a09f3b9425b6' 
  AND token = '0Rt/bvx9MX1GP82g7xjeLxQi6n0+juuISMTfuvCIDAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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