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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7911e349ed9bd39c350dedd6aba506f5ee31c0507ee4262666285e198f3c8bb' 
  AND token = '1RuwytoTEq7JgOdaESpcQK1ACnlanFZi/oG+EnPw41w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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