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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1faf8b4c335325c4dda93b9db6b1982bf608cd83b7ca5e9604308e07ac0f323f' 
  AND token = 'EVjmSQIBcMf9018Fdo+sFJXzMna1qtq0hoEVCrFzEqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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