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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5be678dff9f8ecf7a2e44fd618e7dcadb0206d345b4b943c90c3f9abd335d0b' 
  AND token = 'WDz3ODnmcjgn2DvbifWvN9V+8zojB3Sf/u6NSm88WDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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