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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acd55dc65e255e898ee61feb07d10b524d986476367700b4cfa2dbf1cb7f7f83' 
  AND token = 'E+f5wCkaFFdnEhVhwD/KFM7XuyNvcmXZcZxVaDzN1Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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