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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b09c6b543736bf637b586fd0b59ab9f708379e52ba9172b6bff0f0d2f316c0' 
  AND token = 'Ch3wr5GF9twSR6BqReXHHvhLIA4LTQ8LGpdvRWQf1mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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