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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116f816bc69dbcd0a5bb6fb242144487192fe66f26f084affea1efa4edca0ba6' 
  AND token = 'rXI4n6mMkyTTE330/ZvktZcb1pcXx4SLF8KKACn30Rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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