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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca7706ac881242269253b3810354ace8d3f13cde1ebe1834572a4a752c4d49c' 
  AND token = 'YYkuxMMebvG5veCryfK/2zlu6fNAA5RwEXL3XzQKl+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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