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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77e30c2a4a4a80cbc6cd26633110f0ceccc784faad22d67e56cb6d29f33575bf' 
  AND token = '1Htlo3CQ8WDYvO6AVsUg0GoLoqUpSbJf4CL/oHkNbYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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