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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168582a9174889ad9f3eb97114f3020c18471ce76a466ff6821fa04a71f1e09e' 
  AND token = 'hXlKe4e8W/u6eRM0ACYeUeo+BD/l4wMhgE7FLGl6+I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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