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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '406409b03e56505ddcb97d079ea7939d578ba8c3c5b95657d9ec32d221b2b6d3' 
  AND token = 'AR8NafT3FY4ZP/zmKUy8zkHrqwtxmBY5oR8V0zPEAQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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