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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9838cd5be7b3740a2d86c3ebd1744c65272e2252f2bce789e75e4fa632241058' 
  AND token = '/u3Iaqik0v+lV9PyW8GCtROh9nLZ5DchK4+VO1chC2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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