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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6fa4252f55123399b002dcc1f415f79014e467de666c3853ba3752a5fa0ccb' 
  AND token = 'ctqeSjTlVVDYqSwtOqgooaQwOd0nl7V49FLegaTNUnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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