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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e658e02ec1b811fc7b6e4d16acf2e18c08308ce1c9e83f83c875273262455a6' 
  AND token = '3IXiyz4K3Bd7fDqDYAmbntqmmerht/U2gKg6/CbH2hE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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