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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cf450ddc6721d7d3639fc3976dd0f712dcc2d57748fcf8a26b5a375f11ee9ab' 
  AND token = 'AsrGvPOGKFP8I6ssqE3LIDTxZ82u6YKlPRtDXsfPrDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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