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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77484df68b773d45cbee9b9d495ee926fb9123d0505222e81773c49e4cd0d04c' 
  AND token = '8i6Gtm+O35GgWPIMm6t5OGrA2iqOmLn5ffY3mpry0xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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