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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be9eca3c2e2dad0aec7fc67526d75bf1c3e6cee700a518b3066b2467568cfcc4' 
  AND token = 'T6UAqRqf52MnY46MFlwZ1MBM7myHsievoaHgc5ftPDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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