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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68ed32d4723a3cdd1bde325e5b5bac8545cd57b5648bbc8a14e33de97abfc7a' 
  AND token = 'Rk1e7H6KUnKrdHKmomWZ5x/hu9auDH7wxYeF3kF+kt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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