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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bea298cbc8e6c4942864be17e58d9319932dee9b7b1342f2d1ddeb1f1f58e11a' 
  AND token = 'eE5O/Kn5oloZ5d9cWQn2i3UeKiZWA/dRXam3/RHurAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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