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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a123472cbc523d09c922e70a9871ff9a22e4c63697a823f14f4dc7abcfc1e98' 
  AND token = 'Sqppb2LCEhJ17btP1Li5Nvk5kRa9Y83wQeL8Ukr2k/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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