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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e748534c4c48df95f8d586f90a11dece73a46d8ccdd59637340ca21f1c0ac0c' 
  AND token = '36mi7AhpsLmNSj2pSrX0UwGDONspiq96y+s4VhIroow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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