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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ac5285c0267bfee3303de5239daf21965cd87a145f1994ade64a065475ae8c3' 
  AND token = '7LIRfFDA22HnLLQ8osmlHvnXo3q+hRnzT6RTHz0g7b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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