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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd5b986351349f5188932b4f296e5aef66b2184b2772ab72f98f3d3efa6c4a44' 
  AND token = '7Hejqrws3m87OQaVInMFSahTNm9RPTi8M31XQD9iOko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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