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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7faff52f7ef7c5e61a505e496dd5d515451b333c368e95bf3e56ace7a50d90' 
  AND token = '+uYW6sQeoYOQIPe4VkQbO3HAvO4s1WiFKXHe1fAOLUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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