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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b29276f9dc70c21efabfad6d46a2a17e235014270de4a39975f08067d215a5' 
  AND token = 'zU55DtBOfzlrqd2QuHnFYNWx5EUrRGAoI4H5VpJS63k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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