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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c55a6148c769b7912ff80a16fd6ecaa4bf1792225804e0db92ab605a1bdbfe3' 
  AND token = 'NZFnDAXKRaXp1P8mYCpngEACF1GTVFbMEhAZFWPtFnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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