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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4f0b8614a6711114c1f3dd81543f95dc4e81ec4aebac56f9e92b9cf0d48fdc' 
  AND token = '+cRiredZ9zYptCJn4RYAd/fKVKaoTkVSZT8181E7j4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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