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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8207c62b55f6ff65c5bc9b900a899b68cdb181d47b77e5feba18ca9ffc344fe0' 
  AND token = 'CI562nmj3i2dWjTllabw/O3Xa6vtzox3zaJAS2p5/Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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