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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8385e3720ad5210ec39001d2d862735b361665bd23e839be332b17e95edca23' 
  AND token = '5TSWRvaM2n55u/rSj5gz6FTm5/a+gdVqwCKZzg1gb/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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