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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e623ac4169deb6e50dac1a3ff04032f1297303e48e5dd4a76fcf0fc8a54908' 
  AND token = 'oLoFTTvP42MpgoG5s4oH6iV42CXFgZrCaZfZVRHEV4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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