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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa3f86e4d7f0b6e9c4b93dcc3b8dfd3a2d4c024e46cdfd7be651ea425328db78' 
  AND token = '4SEwhZCE3OtW4xA31GNyj29NUVSzK85gxerVFa3VVEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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