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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c39dca79c195c1a3e908543ca63630d20f616394a8c7d21ae284b195fd0d346' 
  AND token = 'C8/zlfITx9nVC5T4RAgxdvQiMiVt1w1cjd1u1ipaeUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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