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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c81f75148839f3188ee840350dcbeb7ede6116eeb2714228592cb084c5f477b6' 
  AND token = 'UmU1GfYDxRqu5Sq34lH3sSB8O2Esn74ELnAkQgGbyBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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