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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ccbea38d9a4b6fef65f138364bf68d89f19b05664d97ffce3a8a1d8fcbb50b' 
  AND token = '+03fP+hvmkUwqaU6ThddTvl3uZ5s8joAYOB/C1u5jjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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