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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f759e390180a2fb3af1e19c7ca73f62dc89ed0de4cf0b918b86b5cd1b06ffea0' 
  AND token = 'vKr0PWwOEGm20OY/BCJPpIQxyJmBI9LgOsENPR7Yz4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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