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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c676b70d3cdc4c14c9a42b1786342b373c8298916d29733170a2132002909d36' 
  AND token = '2B3ikdl55xqgaKH3a1kKrGWhf/MRvhb8boI+yocz4z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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