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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94328b1d76e6793bf2de104069f1dce6ee0c2025e618330155d535506940f58e' 
  AND token = '7p4fp/uzdW2H21moS3RBN5hL9h8Do3MLZKxan9rTNwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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