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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0209c7dfe6cd9ffee4580bf395705c2001dcd9e9fa5d596b8d8525448c091333' 
  AND token = '6fW/hfpblXRmGRZ1xw54DQpzO4nBrojjR7IAQJLraTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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