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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab40abbc22726e9542ea5d7ee2cf8cf49cf31aa63d81ba7d054122e5222bfe9' 
  AND token = '/HhKliH2dtNI4rvS9gDE2pns0kXp2q7a13M1XH3EpEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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