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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8212097e67de5280f5d3ee1114fc38d6d4ac4f022f9c0c59b6944092b115fa6' 
  AND token = 'XnuUpE0gM3oqPvtiy61QPzzviaH1CsD49QzBRQ6M0o8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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