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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c055e58377449cdeb003ec50e10c84fefe5e6ae31046a4763e097604a59d5802' 
  AND token = 'FejuRTa//OTt71RzFmIT+j29d2ffI1dvsx8jAsQ1Bjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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