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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17154c312ea29ddb0c523fa816a4e011ca962b924ada2d8933f0f83263c8fb44' 
  AND token = 'nl9Vp/rtf3k+jqATljBPmTra8F+cn2vumhLOOY/97+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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