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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae42efa691b39ac804eb83c41ea6fc921a0a73ec684b4762836b884baf2d2959' 
  AND token = '6DP30zo4Zlxv6cAOh55CUgD4039UUQ72fjYFUru4j1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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