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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '695bd5b1d41fe73a9c24fda04911ed8bac1656fce1cc51e2d3e344d22645fe3e' 
  AND token = '7TClMKTPWZkopxbVjehFpRYuVkuA1eaaOd5B9u+Jy+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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