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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1c85d010ca7388356eaeec158de15ff82302c5425b7e8fe97c9e6562042bcab' 
  AND token = 'lIKQnUArUOYc2eK7/GBEmBxTNx7A4MbJ0hg05XYuHJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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